Every single human is made differently. Yes, most of us have the same muscles and bones. No, those muscles and bones are NOT THE SAME from person to person.
You can be tall, short, have long arms, long legs, long femurs (top leg bone), short tibias (lower leg bone), a short torso or long torso, wide hips, narrow hips, deep hip sockets, shallow hip sockets, more forward facing hip sockets, high arches in your feet or flat feet, and the list goes on.
Every body is different. Therefore there CANNOT be one way to squat, one way to bench, one way to deadlift, or one way to do ANYTHING.